Gun control apparatus



4 She etS-Sheet 1 G. E. BARNHART GUN CONTROL APPARATUS v Filed Jan. 3, 1941 April 17, 1945..

NON

INVENTOR. Georqe E. Barnharf. 'BY

April 17, 1945. G. E. BARNHART GUN CONTROL APPARATUS 4 fSheets Sheet 2 Filed Jan. 5, 1941 INVENTOR. George E. Barnhart.

Aprifl 117, 1945. e. E. BARNHART GUN CONTROL APPARATUS Filed Jan. 3, 1941 4 Sheets-Sheet 4 ZZI Patented Apr. 3?, i945 2,373,996'9 arm coarser. arraaarris George E. Earnhart, Pasadena, (Calif.

Application January 3, 1941, Serial No. 372,958

(El. 8M1) 6 Claims.

This invention relates to gun control apparatus.

The general object of my invention is to provide an improved machine gun operating mechanism and sighting device.

A more specific object of the invention is to provide a novel gun mechanism and sight mechanism remote therefrom and synchronized therewith.

Another object of the invention is to provide a novel gun mechanism and sighting device which is remote therefrom and is operated by the movement of the gun.

A further object of the invention is to provide a remotely controlled gun mechanism and a sight device remote therefrom and operated by the movements of the gun mechanism.

Other objects and the advantages of this invention will be apparent from the following description taken in connection 'with the accompanying drawings wherein:

Fig. 1 is a side elevation of an airplane including the features of my invention.

Fig. 2 is an enlarged fragmentary longitudinal section through the tail portion of the airplane shown in Fig, 1, showing one of my devices.

Fig. 3 is afragmentary rear view of the sight device shown in Fig. 2.

Fig. i is a fragmentary section taken on line l-Q of Fig. 3.

Fig. 5 is a fragmentary section taken on line 5-5 of Fig. 4 showing the slide device moved to a straight through viewing position.

Fig. 6 is a view similar to Fig. 5 showing the slide device moved to a position to view through the top eye aperture.

Fig. 7 is a fragmentary top plan section through a portion of the airplane shown in Fig. 1 with portions thereof broken away. a

Fig. 8 is a fragmentary longitudinal central section through .the sight mechanism.

Fig. :9 is a section taken on line 9-9 of Fig. 8.

i is a section taken on line iii-i of 11 is an enlarged fragmentary top plan view of the gun mechanism shown in Fig. 2.

Fig. 12 is afragmentary rear view of the gun mechanism shown in Fig. 2.

Fig. 13 is an enlarged fragmentary section taken on line iii-i3 of Fig. Z.

Fig. 14 is a section taken on line iii-l of Fig. 13.

Fig. 15 is an enlarged top plane view of one of the machine gun Selsyn motors showing the gear housing in section.

Fig. 16 is a section taken on line lfii$ of Fig. 15.

Fig, 17 is a view similar to Fig. of one of the Selsyn motorscf the sight mechanism.

Fig. 181s a section on line lfi-id of Fig. 17.

Fig. 19 is a fragmentary section taken'on line 09-59 of Fig. 8.

Fig. 20 is an enlarged section taken on line 29-213 of Fig. T.

Fig. 21 i's'a section taken on line Ei-Zi of Fig. 20.

Fig, 22 is a section taken on line 22-22 of Fig. 2.0.

Fig. 23 is a section Fig. 22.

fig. 24 is a diagram showing the electrical connections between the Selsyn motors, and

Fig. 25 is a diagram showing the electrical connections between the drive motors and the controlling switch mechanism.

Referring to the drawings'by reference characters, I have shown an airplane ill having thereon a plurality of my improved gun mechanisms and sight devices therefor. In the accompanying drawings, 1 have shown the tail gun mechanism which is indicatedgenerally at 32 and the accompanyingsight mechanism which is indicated generally at E3.

The gun mechanism 52 includes a base housing member it having a chamber portion is on the top thereof.

Above the housing it I provide a pair of spaced guns to which adjacent the rear of the body portions thereof, are connected together by a stirrup member 98 (see Fig. 12) and adjacent the front of the body portion are connected by a bar it? (Fig. 7). The outer sides of each of the gun bodies il has a boss so thereon in which a shaft inernher 2i is secured. The outer ends of each of the shafts iii are pivotly mounted in hearing members 22 which are secured to a circular frame The frame 23. has a plurality of rollers 2-5 equally spaced therearound which are supported on a circular track 25 which is supported by suitable frame members 25. The rollers 241 are re tained in engagement with the track 25 by a clasp ring 2? suitably secured to the track.

The circular frame 23 has a circular geartoothed rack 28 on the under face thereof which is engaged by a gear 29, which is driven by an electric motor 3% through a built in gear reduction device 38; The motor at is shown as mounted on a bracket 31 secured to the track 25.

Mounted on the-frame 23 I provide a hemispherical metal shield 82 over the uns it which has a pair of slots 33 therein through which the taken on line 23-22 of gun barrels project. When the motor 39 operates ,the'gear 29 through the medium of the rack 28 rotates the frame 23 and thereby swings the guns I6 about a vertical axis.

Mounted on one of the shafts M I provide a gear 39 which, meshes with a gear 35 which is driven by an electric motor 36 through a built in gear reduction drive 36'. 'Ihe motor 39 is shown as mounted on a bracket 31 secured to the frame 23. .When the motor 36 operates it, through the medium ofv the gears 34 and 35 rotates the shafts 2i and swings the guns I6 about a horizontal axis.

Between the gun bodies It one of the bodies has a gear 38 secured thereto which meshes with a reduced gear 39 on a shaft 49 which is rotatably mounted in spaced bearing portions M of a bracket member 42. The bracket member 42 includes a hollow vertical sleeve 43 having pp0- sitely extending arms 44 (Fig. 12) thereon each of which includes a bearing portion 45 surrounding one of the shafts 2i to support the bracket. The sleeve portion 43 of the bracket extends into the base chamber I through an aperture 46 in the top thereof and is positioned in an aperture 4I in the top-of the base housing I4.

Positioned in the sleeve 43 I provide a vertically reciprocating rod 48 which includes a circular geartoothed rack portion 49 adjacent the upper end and a similar geartoothed rack portion 59 adjacent the lower end. -Rotatably mounted on the bracket 42 I provide an idler gear M which meshes with a gear 52 on the shaft 49.

Thus when the guns I6 are moved about their horizontal axis-as previously described, the gear 38 rotates the gear 39 and the gear 39 rotates the shaft 49 which in turn-rotates the gear, 52 which rotates the idler gear M which in turn through the medium of the rack portion 49 moves the rod 48 vertically.

. The lower rack portion 59 of the rod 48 is engaged by a gear 53 on a shaft 54 which is rotatably supported in spaced flanges 55 integral with .the housing I4. The gear 53 meshes with a gear 56 on a shaft 51 which is rotatably supported by the flanges 55 and has a worm pinion 58 thereon. Within the housing I4 adjacent the flanges 55 I provide a Selsyn motor 69 having a gear reduction' housing BI thereon.

As shown in Figs. and 16 within the housing BI I provide a. shaft 62 rotatably mounted in a bearing portion'63. Mounted-on one end of the shaft 62 I provide a worm pinion 64 which meshes with a worm gear 65 on the armature shaft of the Selsyn motor 69. Mounted on the opposite end of the shaft 62 I provide a worm gear 66 which meshes with a worm pinion SII on a shaft 68 which is rotatably mounted in'abearing portion 69. Exterior to the housing 66 the shaft has a worm gear I9 thereon which meshes with the worm pinion 58. t Y e Thus when the rod 48 is moved vertically'as previously described the gear trainconsisting of the gears 53, 56 and 59 rotate the gear 19 which in turn through the mediumof the shaft 69 and the gear train consisting of the gears 64, 65, 66 and 61 rotates the Selsyn motor 69.

Mounted on the sleeve 43 within the chamber I5 I provide a gear 'II which meshes with a gear 12 on a vertical shaft I3 rotatably mounted in a bearing portion I4 of the housing. Within the housing the shaft I3 has a'worm pinion I5 thereon which meshes with a worm gearl'IG of a. reduction gear mechanism 11 of a Selsyn" motor I8. The

reduction gear mechanism II of the Selsyn 'tions 92 of the airplane.

motor I8 is the same as the reduction gear mechanism previously described in connection with the ,Selsyn motor 99 and shown in Figs. 15 and 16.

Thus when the guns it are moved about a vertical axis, as previously described the bracket sleeve 93 rotates the gear III which through the geartrain consisting of the gears I2, I5 and I9 and the gear reduction mechanism I'I rotates the Selsyn motor I9.

The sight mechanism I3 includes a hollow vertical standard 89 having a hollow housing portion 9i thereon adjacent the upper end. The standard 89 is shown as mounted on frame portion 82 of the airplane and is braced :by arms 83 secured to the track 25. Above the housing I provide a bracket member 84 which includes spaced vertical flanges 85 connected adjacent one end by a transverse holding member 86. Each of the flanges 85 has a boss 81 (Fig. 19) thereon which has a shaft 88 secured thereto. Each of the shafts 88 is rotatably mounted ina bearing member 89 (Fig. 7) mounted on a ring 99. Surroundin the ring 99 I provide an aluminum channel iron track member 911 which is suitably mounted on frame por- The ring 99 includes a plurality of equally spaced rollers 93 (Fig. 2) therearound which are positioned in the track 99.

Mounted on the holding member 86 of the bracket 85 I provide a sight member 94 which includes a main horizontal viewing tube 95 having an eye piece .96 at one end. Adjacent the opposite end I provide a reflector member 91 which surrounds the tube 95 and is mounted thereon. The outer edge of the reflector 91 is curved inward as at 98 and has a. fluorescent or other light tube 99 supported in the portion 98.

When the light tube 99 is illuminated the portion 98 reflects the rays therefrom rearward against the main body of the reflector 91 which in turn reflects them outward.

Intermediate the eye piece 96 and the reflector 91 the sight member includes a downwardly exsight device includes a tube I94 which opens into the tube 95 and has an eye piece I95 thereon.

At the juncture of the tubes 95, I99 and I94 I provide a slide member I96 which adjacent one end has a chamber I9'I therein with an aperture I98 opening thereinto through the bottom wall and an aperture I99 opening thereinto through the front wall and has a prism I I9 therein which when the slide I96 is in the position shown in Figs. 4 and 8 directs light rays from the tube 95 downward through the tube I99. At the juncture of the tubes I99 and I92 I provide a prism I I2 which directs light rays reflected from the prism H9 through the tube I92 towards the eye piece I93. Intermediate the length thereof the slide I96 has a horizontal aperture II3 therein which when the slide I96 is movedto align it with the tube with the tube 94 as shown inFig. 6 directs light aeraooo rays from the tube 235 through the tube Itt towards the eye piece IE5.

Coaxial with the standard at and thereabove I provide a hollow sleeve member I which includes outwardly extending arms I2I (Fig. 3) with each arm including a bearing portion I22 surrounding the adjacent shaft 38. Adjacent the top thereof the sleeve I20 further includes rearwardly and upwardly extending spaced bracket portions I23 (see Figs. 3, 8 and 19).

Positioned in the sleeve IZII and vertically reciprocal therein I provide a rod IZQ which adjacent the upper end includes a circular geartoothed rack portion I and adjacent the lower end includes a similar rack portion I25.

Rotata-bly mounted on one of the brackets I23 I provide a gear I271 which meshes with the rack portion I25 and with a gear I28 mounted on shaft I253 which is rotatably supported by the brackets I23. Also mounted on the shaft I provide a gear I30 which meshes with a gear I which is rotatably mounted on a stud shaft secured to one of the bracket arms 85. (See Fig. 19.) Rotatably mounted on the stud shaft I32 and suitably secured to the gear IBI I provide an enlarged worm gear I33 which meshes with vertically positioned worm pinion I3 3.

The worm pinion Ice is mounted on a shaft I35 which is'rotatably supported in spaced bearing portions I 35 integral with one of the bracket arms bevel gear I33 thereon which meshes a bevei gear I39 on a horizontal shaft I Iii.

The shaft I lII extends rearwardly and is rotatably supported in a plurality of bearing portions MI which are integral with one of the bracket arms 85. At the rear end thereof the shaft I653 has a hand crank Hi2 thereon for manually rotating it.

The lower portion of the sleeve extends down into the housing ti through an aperture M3 in the top thereof and within the housing it has a gear I III rotatably mounted thereon. Above the gear I III the sleeve has a worm gear I65 secured thereto which meshes with a worm pinion Mt mounted on a horizontal shaft- I II which is rotatably supported in bearing members I4 8 se-= cured to the gear M6. The shaft I I'I extends outwardly to one side of the device where it a hand crank M9 thereon for manually operating The gear I III meshes with a reduced pinion gear I5II mounted on a, vertical" shaft I5! which is rotatably supported in a bearing portion I5I' of the housing BI. Below the housing the shaft I5I has a worm gear I52thereon. Opposite the bearing portion I5I' the housing includes a pair of spaced depending flanges I53 which 'rotatably support a shaft liid having a'gear I55 thereon.

The gear I55 at one side meshes with the rack portion I26 of the rod I241 and at the opposite side it meshes with a gear I56 on a shaft I5I which is rotatably supported by the flanges I53. Also mounted on the shaft I51 I'provide a. worm gear I58. For driving the gear I58 I provide afSelsyn motor I60 which is shown as mounted on a. bracket'portion IBI integral with the standard The Selsyn motor I60 like the previously described Selsyn motor 60 includes a, gear reduction mechanism I62 encased in a housing I63 and shown indetail in Figs. 1'7 and 18.

- Within the housing I631 provide a shaft I54 rotatably supported in a bearing portion I65 and at one end it has a. worm gear I65 thereon which meshes with a worm pinion I61 on the armature shaft of the "Selsyn motor IE8. The opposite end of the shaft IIiI has a worm pinion I68 thereon which meshes with a worm gear IE9 on a shaft III. which i rotatably supported in a bearing portion III of the housing I63. Exterior to the housing the shaft III? has a worm pinion H2 The lower portion of the shaft I35 has a thereon which meshes with the worm gear I53.

For driving the previously mentioned worm gear I52 I provide a Selsyn motor I73 which is mounted on a bracket I'M integral with the standard. 80. The Selsyn" motor H3 like the FSelsyn motor I60 includes a gear reduction mechanism I75 encased in a housing I 15 0nd which is imilar in all respects to the previousiy described gear reduction mechanism It? and includes a drive worm pinion III which meshes with the worm gear I52.

As shown in Fig. 24 one. side of the field. I88 of the Selsyn motortl is connected by a wire ItI to one side of the field I82 of the Selsyn motor its and. the other sides of the fields are connected by a wire I83. The armature contacts [ltd of the Sel yn motor I50 are connected to the armature contacts I85 Of the Selsyn motor I80 by wires I86. Electrical power is supplied to the field wire IIII by a wire I8? from one side of a suitable source of electrical energy (not shown) and electric power from the other side of the source of power is supplied to the field wire I83 by a wire I88.

One side of the field I83 of the Selsyn motor I8 is connected by a wire I to one side of the field IISI of the Selsyn motor H5 and the other sides of the field are connected by a wir I92. Electrical power is supplied to the wire I90 by the wire and electrical power is supplied to the wire I532 by the wire I88. The armature contacts I of the Selsyn motor 18 are connected to the armature contacts I96 of the Selsyn motor 7 worm pinion I 12 thereof drives the worm gear I58 which through the medium of the shaft I5I, gear I55 and gear I55 through the medium of the rack I 25 moves the rod I26 vertically.

As the rod I26 is thus moved it, through the medium of the rack I25, rotates the gear I2? which'in turn rotates the gear I28 and through the shaft I25 rotates the gear I30. The gear I50 rotates the gear I3I and the worm gear I33 rotates therewith. As the worm gear I33 is thus rotated it, thmugh engagement with the worm pinion, swings the bracket 86 vertically.

To compensate for the vertical parallax between the guns and the sight mechanism the operator may rotate the hand crank M2 to rotate the worm pinion I36 which when rotated will travel around the worm gear I33 to move the bracket 8% up or down depending on which way is necessary. To compensate for the horizontal parallax between the guns and the sight mechanism the operator may rotate the hand crank I49 to rotate the worm pinion I46 .which when rotated will rotate the wonm gear I 15 and therethrough the sleeve I20.

When the Selsyn" motor I15 is operated the worm pinion I'I'I thereof drives the Worm gear I52 which through the medium of the shaft I5I drives the pinion gear Hill which in turn rotates the gear M l. When; the gear M l is rotated it through the medium of the worm pinion H56 mounted thereon moves the worm gear M55 with it which in turn rotates the sleeve fl2il about the axis of the rod 526. As the sleeve Mil is thus rotated it through the medium of the arms nan swings the shafts Bit and therethrough rotates the bracket 86 horizontally about the axis of the rod H26.

Adjacent the standard 80 I provide an operators seat H598 mounted on an arm it? which includes a bearing portion ltiisurrounding the standard 8t and supported on a flange B99 integral with the standard. Opposite the arm Hill] the seat 696 includes a pair of spaced legs 2% each having upper and lower rollers till thereon which are positioned in a channel iron tract: 282.

For operating the electric drive motors to and 36 I provide a switch mechanism which is indicated generally at 205-and shown as mounted on a bracket 2% (see Fi 7) secured to the seat Q96. As shown the switch mechanism 265 (Figs. -23) includes an enclosed housing 28' having an upwardly projecting hollow neck 2% having a slot 2% therein. Positioned in the slot 2% I provide a hollow sleeve d which is pivotly secured to the neck 288 as at 2M. Extending downwardly from the sleeve 2MB I provide an arm portion 262 which terminates in a right angularly bent flange portion 2H3. Mounted on the wall of the housing adjacent the arm 282 and suitably insulated therefrom I provide an electrical arcuate contact track 2 i l and adjacent the track 2 i l I provide a pair of spaced rheostat collsEli-t and 2:16.

On the arm 252 and suitably insulated therefrom I provide a contact bar 2 i i which is adapted to bridge between the contact track 236 and either of the rheostat coils 255 and, 2&6. Positioned in the sleeve 2th and rotatable therein I provide a shaft are having an operating handle 2m thereon above the sleeve.

Mounted on the flange tit and suitably insulated therefrom I provide an arcuate electrical contact track 22d and adjacent the track 1 provide a pair of spaced rheostat coils ME and 222. Mounted on the shaft 253 within the housing 2H I provide an arm 223 having an electrical contact bar 22 3 thereon and suitably insulated therefrom. The contact bar 226 is' adapted to bridge between the contact track 226) and either of the rheostat coils Hi and 222.

As shown in the diagram in Fi 25 the contact track 2 id is connected by a wire 225 to one side of a suitable source of electrical energy (not shown) and the contact track 220 is connected by a wire 226 to the wire 225.

The other side of the source of electrical energy is connected by a wire to one side of one field of'the reversible motor 36 by a wire 221 and to one side of the other field by a wire 228. One side of one field of the reversible motor 30 is connected by a wir 29 to the wire 22'! and one side of the other field is connected by a wire 230 to the wire 227. One end of the rheostat coil 2I5 is connected by a wire 23I to one terminal of the motor 36 and one end of the rheostat coil 2l6 is connected by a wire 232 to the opposite terminal of the motor 36. I

When the contact bar 2|! is moved to bridge between the contact track 2! 4 and the rheostat coil 216 current is directed to the motor 36 to opcrate it to move the guns I6 upward and when the contact bar 2" is moved to bridge between the contact track 2M and the rheostat coil 2E5 current is directed to the motor 36 to operate it to move the guns l6 downward. i

The contact bar 2!? is moved into engagement with the rheostat coils 2 I 5 and 2 M by the operator rocking the sleeve 2 I!) about the axis of the [pivot 2M which in tum swings the arm 2l2 on which the contact bar 2!! is mounted.

One end of the rheostat coil 22! is connected by a. wire 233m one terminal of the motor 30 and one end of the rheostat coil 222 is connected by a wire are to the opposite terminal of the motor 30.

When the contact bar :24 is moved to bridge between the contact track 220 and the rheostat coil 22E current is directed-to the motor 30 to operate it to swing the guns 16 to the right and when the contact bar 224 is moved to brid b tween the contact track 220 and the rheostat coil 222 electrical current isdirected to the motor 36 to operate it to swing the guns IE to the left.

The contact [bar 5124 is moved into engagement with the rheostat coils 2M and 222 by the operator rotating the operating handle 259 in the di rection in which he wants the guns to swing.

In operation when the guns G6 are in a horizontal position and directed directly rearward as shown in Fig. 2, and the operator desires to swing the guns upward he grasps the operating handle 2W of the switch mechanism 265 and swings it rearwardly thereby causing current to be directed to the motor 36 which then operates to swing the guns to upwards as previously described. To stop by directing current to the motor 38 to operate it to swing the guns l6 downward as previously de scribed.

To stop the downward movement of the guns the operator swings the operating handle 2m to a straight vertical position.

As the guns move vertically upward and move the sight device 95 the operator first peers through the eye piece I03 and as the guns continue to move upward the operator "moves the position the operator moves the slide member we to alignthe chamber H4 with the tube and then peers through the eye piece I05.

When the operator desires to swing the guns I6 horizontally to the right or left he rotates the operating handle 2l9 in the direction in which he wants the guns to swing thereby causing the motor 30 to operate to swing the guns as previously described. To stop the horizontal movement of the guns the operator rotates the operating handle 2m to a. neutral position wherein the contact bar 224 does not engage either of the rheostat coils 22l or 222.

' At night the fluorescent tube in the reflector 91 is illuminated and as the night device 94 moves in unison with the guns IS a. beam of light i directed onto the target at which the guns are pointed.

As shown in Fig. 1 other gun stations such as is indicated at 235, 236, 231 and 238 and their associated sight stations such as indicated at 239, 240, 24! and 242 respectively may be located at various positions on the airplane.

From the foregoing description it will be apparent that I have provided a novel remotely controlled gun mechanism and a remote sight device therefor which is' simple in construction and highly efiicient in use.

I claim:

1. A gun and sight synchronizing device including a gun mounted for rotation about vertical and horizontal axes, a member mounted to rotate with the gun in its movement about its vertical axis, a rack member having a pair of rack portions thereon and mounted to reciprocate and to rotate upon said member, said rack portions having circular teeth, gear means connecting said gun and one of said rack portions and driven by movement of the gun about its horizontal axis and constructed and arranged to transmit a drive from the gun to the one rack portion, a generator unit, means connecting the other rack portion to said generator unit and constructed and arranged to transmit a drive from said other rack portion to said generator. unit, a second generator unit, gear means connecting said member to said second generator unit and constructed and arranged to transmit a drive from said member to said second generator unit, a sighting device including a viewing member mounted for rotation about vertical and horizontal axes, a first receiver unit for controlling movement of the sighting device about its horizontal axis, a second receiver unit for controlling movement of the sighting device about its vertical axis, means operatively connecting said first generator unit and said first receiver unit and means operatively connecting said second generator unit and said second receiver unit. 1

2. A gun and sight synchronizing device including a gun mounted for rotation about vertical and horizontal axes, a member mounted to rotate with the gun in its movement about its vertical axis, agear rotatable with the gun about its horizontal axis, a rack member having upper and lower racks thereon and mounted to reciprocate and to rotate in said member about the vertical axis of said gun mount, said racks each having circular teeth, another gear engaging the upper rack, means connecting said gears and constructed and arranged to transmit a drive from the first gear to the other gear, a generator unit, means connecting said lower rack to said generator unit and constructed and arranged to transmit a drive from said lower rack to said generator unit, a gear fixed on said member, a second generator unit, means connecting said member gear to said second generator unit and constructed and arranged to transmit a drive from said member to said second generator unit, a sighting device including a viewing member mounted for rotation about vertical and horizontal axes, a first receiver unit for controlling movement of the sighting device about its horizontal axis, a second receiver unit for controlling movement of the sighting device about its vertical axis, means operatively connecting said first generator unit and said first receiver unit and means operatively connecting said second generator unit and said second receiver unit.

3. A gun and sight synchronizing device including a gun mounted for rotation about vertical and horizontal axes, a sleeve mounted to rotate with the gun in its movement about its vertical axis, a gear rotatable with the gun about its horizontal axis, a rack member havingupp'er and lower racks thereon and mounted to reciprocate and to rotate in' said sleeve, said racks each having circular teeth, another gear engaging the upper rack, means connecting said gears and constructed and arranged to transmit a drive from the first gear to the other gear, a generator .unit, means connecting said lower rack to said generator unit and constructed and arranged to transmit a drive from said lower rack to said generator unit, a gear fixed on said sleeve, a second generator unit, means connecting said sleeve gear to said second generator unit and constructed and arranged to transmit a drive from said sleeve to, said second generator unit, a sighting device including a viewing member mounted for rotation about vertical and horizontal axes, a first receiver unit for controlling movement of the sighting device about its horizontal axis, a second receiver unit for controlling movement of the sighting device about its vertical axis, means operatively connecting said first generator unit and said first receiver unit and means operatively connecting said second generator unit and said second receiver unit. a

4. A gun and sight synchronizing device including a gun mounted for rotation about vertical and horizontal'axes, an arm mounted to rotate with the gun in its movement about its vertical axis, a vertical sleeve mounted to move with said arm about the vertical axis of rotation of the gun, a gear rotatable with the gun about its horizontal axis, a second gear driven by said first gear, a rod mounted to reciprocate and to rotate in said sleeve, said rod having upper and lower racks thereon, said racks each having circular teeth, a third gear engaging the upper rack, a fourth gear mounted coaxial with and for rotation with the second gear and engaging said third gear, a generator unit, means connecting said lower rack to said generator unit and constructed and arranged to transmit a dri e from said lower rack to said generator unit, a 11th gear fixed on said sleeve, a second generator unit, means connecting said fifth gear to said second generator unit and constructed and arranged to transmit a drive from said fifth gear to said second generator unit, a sighting device including a viewing member mounted for rotation about vertical and horizontal axes, a first receiver unit for controlling movement of the sighting device about its horizontal axis, a second receiver unit for controlling movement of the sighting device about its vertical axis, means operatively connecting said first generator unit and said first receiver unit and means operatively connecting said second generator unit and said second receiver unit.

5. A gun and sight synchronizing device including a gun mounted for rotation about vertical and horizontal axes, a pairof arms mounted to rotate with the gun in its movement about its vertical axis, a vertical sleeve mounted to move with said arms about the vertical axis of rotation of the gun, a gear rotatable with the gun about its horizontal axis, a second gear mounted gear mounted coaxial with and for rotation with the second gear and engaging said third gear, a generator unit, means connecting said lower rack to said generator unit and constructed and arranged to transmit a drive from said lower rack to said generator unit, a fifth gear fixed on said sleeve, a second generator unit, means connecting said fifth gear to said second generator unit and constructed and arranged to transmit a drive from said fifth gear to said second generator unit, a sighting device including a viewing member mounted for rotation about vertical and horizontal axes, a first receiver unit for controlling movement of the sighting device about its horizontal axis, a second receiver unit for controlling movement of the sighting device about its vertical axis, means operatively connecting said first generator unit and said first receiver unit and means operatively connecting said second generator unit and said second receiver unit.

6. A gun and sight synchronizing device including a gun mounted for rotation about vertical and horizontal axes, a pair of arms extending below the gun and mounted to rotate with the gun in its movement about its vertical axis, a bracket fixed on said arms, a vertical sleeve fixed on said bracket, the axis of said vertical sleeve coinciding with the vertical axis of rotation of the gun,

a gear rotatable with the gun about its horizontal axis, a shaft on said bracket and spaced from the horizontal axis of rotation of said gun, a second gear fixed on said shaft and engaging said first gear, a cylindrical rod mounted to reciprocate and to rotate in said sleeve, said rod having racks at the upper and lower ends thereof, said racks each having circular teeth, a third gear rotatably mounted on said bracket and engaging the upper rack, a fourth gear fixed on said shaft and engaging said third gear, a generator unit, means connecting said lower rack to said generator unit and constructed and arranged to transmit a drive from said lower rack to said generator unit, a fifth gear fixed on said sleeve, a second generator unit, means connecting said fifth gear to said second generator unit and constructed and arranged to transmit a drive from said fifth gear to said second generator unit, a sighting device including a viewing member mounted for rotation about vertical and horizontal axes, a first receiver-unit for controlling movement of the sighting device about its hori zontal axis, a second receiver unit for controlling movement of the sighting device about its vertical axis, means operatively connecting said first generator unit and said first receiver unit and means operatively connecting said second generator unit and said second receiver unit.

GEORGE E. BARNHAR'I. 

